Table 3.

Global rating of reviewed studies for quality assessment

Study N.	Selection bias	Study design	Confounders	Blinding	Data collection methods	Dropouts	Intervention integrity	Analysis	Global rating of paper
1	2	2	2	2	1	1	1	1	Strong
2	2	2	2	2	1	1	1	1	Strong
3	1	1	1	2	1	1	1	1	Strong
4	1	1	1	2	1	1	1	1	Strong
5	1	1	1	2	1	1	1	1	Strong
6	1	1	1	2	1	1	1	1	Strong
7	1	1	1	2	1	1	1	1	Strong
8	1	1	1	2	1	1	1	1	Strong
9	1	1	1	2	1	1	1	1	Strong
10	1	1	1	2	1	1	1	1	Strong
11	1	1	1	2	1	1	1	1	Strong
12	1	1	1	2	1	1	1	1	Strong
13	1	1	1	2	1	1	1	1	Strong
14	1	1	1	2	1	1	1	1	Strong
15	1	1	1	1	1	1	1	1	Strong
16	1	2	1	1	1	1	1	1	Strong
17	2	2	2	2	1	1	1	1	Strong
18	2	2	2	2	1	1	1	1	Strong
19	2	2	2	2	1	1	1	1	Strong
20	2	3	3	3	1	1	1	1	Weak
21	2	2	2	2	1	1	1	1	Strong
22	2	2	2	2	1	1	1	1	Strong
23	2	2	2	2	1	1	1	1	Strong
24	2	2	2	2	1	1	1	1	Strong
25	2	2	2	2	1	1	1	1	Strong
26	2	2	2	2	1	1	1	1	Strong

GLOBAL RATING FOR PAPER = 1; STRONG (no WEAK ratings), 2; MODERATE (one WEAK rating) and 3; WEAK ((two or more WEAK ratings)